The people this will appeal to are a small and, hopefully, insignificant portion of the electorate.

Wrong. This is for Trump's base of fascists, white supremacists, and the ignorant and entitled who are so insecure that they look at Trump and see an ideal of power. That is easily 40% of the US electorate.

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The people this appeals to are never going to heed any other message or argument.

Correct. The only thing that matters to them is that Trump is a white man who acts solely in the interest of white people, and - this part is the key - at the expense of all others.